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<h2>How to use Timestep References.</h2>
You can refer to a variable in an other timestep using the following
notation:<br>
<ul>
  <li>F1[+] - means the variable F1 in the next timestep.</li>
  <li>Int1[-] - means the variable Int1 in the previous timestep.</li>
</ul>
In the first timestep you are not allowed to refer backward and in the
last timestep you are not allowed to refer forward.<br>
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